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The structural repair and reinforcement of port cranes can extend their service life.
Release Time：
2019-06-14 13:48:44
Nowadays, crane equipment is a common type of machinery used for loading, unloading, and handling operations. It is employed when tasks are beyond the capability of manual labor. In other words, cranes are valuable helpers for people, playing a vital role in work and daily life, and contributing to the development of the national economy.
Crane Equipment and Its Chassis Reinforcement for Port Applications
Nowadays, crane equipment is a common type of loading, unloading, and handling machinery. It is used when manual work is infeasible—In other words, cranes are valuable assistants to people, playing a crucial role in work and daily life while promoting the development of the national economy. Port cranes, in particular, boost the port’s economic and trade activities. Occasionally, reinforcement is required to extend their service life and enhance their performance.
Reinforcement Scheme
The chassis adopts a beam-type structure, mainly bearing bending stress. Stress concentration occurs at the part far from the outriggers and connected to the slewing mechanism, and the cross-section of this chassis is a box-type structure. Based on these actual conditions and combined with construction requirements, we decided to adopt a scheme where the vertical plates and horizontal plates are reinforced by attaching additional plates respectively, and the two attached plates are welded into an integrated unit with a diagonal tension plate. In this way, the three plates form a stable tripod structure. Through theoretical calculations, the strength is increased by more than 15%, which meets the actual application requirements.
Material Quality
The material of the additional plates is similar to that of the crane itself to ensure good welding results, and the material performance must meet the strength requirements. After selecting the appropriate materials, samples are taken from both the base material (of the crane) and the new material (for reinforcement), which are then welded together for a destructive test. The test result shows that the base material fractures—this indicates that the strength of both the new material and the welded joint is higher than that of the base material, thus ensuring the construction quality and meeting the strength requirements.
Welding Process
Requirements are imposed on six key aspects: cleaning and preheating, electrode drying, processing of reinforcement plates, welding machine preparation, welding procedure execution, and post-welding heat preservation. These measures collectively ensure the construction quality.
Strength Inspection
Inspect the welded parts for missing welds and burn-through, and verify whether they meet the application requirements. After reinforcement, the structural components need to be tested to determine the percentage increase in the strength of the chassis structural components. This percentage is then compared with the required 15% to conclude whether the construction is qualified.
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